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js實現停留幾秒sleep

js中沒有自帶的sleep方法,要想休眠要自己定義個方法

function sleep(numberMillis) {    
var now = new Date();    
var exitTime = now.getTime() + numberMillis;   
while (true) { 
now = new Date();       
if (now.getTime() > exitTime) 
return;    

}